Melissa Ann Ritzen, NP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

AP8795 Issued in AZ

Practice address

5983 E Grant Rd Ste 101
Tucson, AZ 85712-2366

Phone

(520) 420-1966

Fax

(866) 733-1907

NPI assigned

Jun 21, 2016

Last updated

Aug 9, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in AZ

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: melissa.ritzen@1000483341926404.direct.elationemr.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Arizona Physician Group PLLC

  dba Sanova Medical Group

  • Internal Medicine Physician
  • Tucson, AZ
  • NPI 1578272555
  Medicare reassignment NPD
• Sanova Urgent Care PLLC

  • Urgent Care Clinic/Center
  • Tucson, AZ
  • NPI 1144106451
  Medicare reassignment NPD
• Hospitalists of Arizona, LLC

  dba IPC - The Hospitalist Company

  • Hospitalist Physician
  • Phoenix, AZ
  • NPI 1578564860
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1466467200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786233600000",
    "number": "1770933780",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5983 E GRANT RD STE 101",
            "address_2": "SUITE 101",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857122366",
            "telephone_number": "520-420-1966",
            "fax_number": "866-733-1907"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5983 E GRANT RD STE 101",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857122366",
            "telephone_number": "520-420-1966",
            "fax_number": "866-733-1907"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "15883 N Oracle Rd Ste 155",
            "address_purpose": "LOCATION",
            "city": "Tucson",
            "state": "AZ",
            "postal_code": "857399117",
            "country_code": "US",
            "telephone_number": "520-420-1966",
            "fax_number": "866-733-1907",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "RITZEN",
        "first_name": "MELISSA",
        "middle_name": "ANN",
        "name_prefix": "Ms.",
        "credential": "NP-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2016-06-21",
        "last_updated": "2026-08-09",
        "certification_date": "2026-08-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "AZ",
            "license": "AP8795",
            "primary": true
        },
        {
            "code": "163W00000X",
            "taxonomy_group": "",
            "desc": "Registered Nurse",
            "state": "AZ",
            "license": "RN140989",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• David Moore Ritter, RN
• Jesse Ritter, MD
• Lisa Joy Ritter, PA-C
• Kara Schall Ritterpusch, DMD
• Patricia Agnes Ritz, PHARM D, BCPS
• Ruly-Francois Rivas Lafreniere
• Cynthia G. Rivas Pajuelo, MD
• Erik Rivas
• Glenda Dalina Rivas, MA, LPC, NCC, SEP
• Marissa Rivas, RBT

• Family Nurse Practitioner in Tucson, AZ
• Providers in Tucson, AZ by specialty
• Family Nurse Practitioner in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 9, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.